Re: [PSES] 61010-1 hazardous live classification

2024-02-28 Thread James Pawson (U3C) 
Hello all,

 

Thanks for all the responses and for some thoughts on the nuances. I'm
helping a customer with their risk assessment so being able to understand
the risks a little better is most useful.

 

Someone pointed out the relaxation in EN 62368-1 for pulse amplitudes based
on duty cycle which is also going to be useful.

 

Much appreciated as always.

 

All the best

James

 

James Pawson

Managing Director & EMC Problem Solver

 

Unit 3 Compliance Ltd

EMC : Environmental & Vibration : Electrical Safety : CE & UKCA :
Consultancy

 

www.unit3compliance.co.uk   |
ja...@unit3compliance.co.uk   

+44(0)1274 911747  |  +44(0)7811 139957

2 Wellington Business Park, New Lane, Bradford, BD4 8AL

Registered in England and Wales # 10574298

 

Office hours:

Every morning my full attention is on consultancy, testing, and
troubleshooting activities for our customers' projects. I'm
available/contactable between 1300h to 1730h Mon/Tue/Thurs/Fri.

For inquiries, bookings, and testing updates please send us an email on
 he...@unit3compliance.co.uk or call
01274 911747. Our lead times for testing and consultancy are typically 4-5
weeks.

 

 

 

 

From: James Pawson (U3C)  
Sent: Monday, February 26, 2024 1:38 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [PSES] 61010-1 hazardous live classification

 

Hello all,

 

I hope this safety question is a fairly simple one for you, it being Monday
after all.

 

1.  A piece of equipment with a power supply output for driving a lamp.
It has two modes, DC and pulsed.
2.  Both of the output voltage connections are on accessible terminals
(checked using finger probe)
3.  Classifying voltages as per EN 61010-1 clause 6.3.1 (limit values
for accessible parts, normal operating conditions)
4.  DC mode runs at 46Vdc maximum. This is less than 60Vdc so is not
Hazardous Live
5.  Pulse mode runs at 46Vdc pulsed (frequency up to 1kHz, duty cycle
can vary down to 0.01%) which is an AC waveform greater than 42.4V peak so
is Hazardous Live
6.  The output from the equipment is low impedance so is more than
capable of sourcing the required 0.7mA through the IEC 60990 body model.

 

Quick sketch attached to illustrate the concept. I even ran a SPICE
simulation to make sure I wasn't getting something wrong.

 

I would appreciate the sanity check!

 

All the best

James

 

James Pawson

Managing Director & EMC Problem Solver

 

Unit 3 Compliance Ltd

EMC : Environmental & Vibration : Electrical Safety : CE & UKCA :
Consultancy

 

www.unit3compliance.co.uk   |
ja...@unit3compliance.co.uk   

+44(0)1274 911747  |  +44(0)7811 139957

2 Wellington Business Park, New Lane, Bradford, BD4 8AL

Registered in England and Wales # 10574298

 

Office hours:

Every morning my full attention is on consultancy, testing, and
troubleshooting activities for our customers' projects. I'm
available/contactable between 1300h to 1730h Mon/Tue/Thurs/Fri.

For inquiries, bookings, and testing updates please send us an email on
 he...@unit3compliance.co.uk or call
01274 911747. Our lead times for testing and consultancy are typically 4-5
weeks.

 

 

 

 

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Re: [PSES] 61010-1 hazardous live classification

2024-02-28 Thread Bansi Patel 
James:

 

I think it was Richard Nute, who has been instrumental is grounding and safe
equipment throughout his carrier.

He would love to hear from you.

He will be guest speaker for Virtual chapter of PSES (Product Safety
Engineering Society) of IEEE in coming months. 

Please send me an email and I can provide you with the details.

 

Best Regards and Be Safe

Bansi Patel

BRP Consultants

PSES BoG at large 2020-2023

PSES Vice President of Conferences 2020-2024

bansipate...@gmail.com  

M:   909-260-9403

Please plan to attend Face-to-Face event: 

ISPCE  2024, (April 30-May 2, 2024); Chicago Area, Illinois, USA

https://2024.psessymposium.org  

 

From: James Pawson (U3C)  
Sent: Wednesday, February 28, 2024 1:39 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] 61010-1 hazardous live classification

 

Hello all,

 

Thanks for all the responses and for some thoughts on the nuances. I'm
helping a customer with their risk assessment so being able to understand
the risks a little better is most useful.

 

Someone pointed out the relaxation in EN 62368-1 for pulse amplitudes based
on duty cycle which is also going to be useful.

 

Much appreciated as always.

 

All the best

James

 

James Pawson

Managing Director & EMC Problem Solver

 

Unit 3 Compliance Ltd

EMC : Environmental & Vibration : Electrical Safety : CE & UKCA :
Consultancy

 

www.unit3compliance.co.uk   |
ja...@unit3compliance.co.uk   

+44(0)1274 911747  |  +44(0)7811 139957

2 Wellington Business Park, New Lane, Bradford, BD4 8AL

Registered in England and Wales # 10574298

 

Office hours:

Every morning my full attention is on consultancy, testing, and
troubleshooting activities for our customers' projects. I'm
available/contactable between 1300h to 1730h Mon/Tue/Thurs/Fri.

For inquiries, bookings, and testing updates please send us an email on
 he...@unit3compliance.co.uk or call
01274 911747. Our lead times for testing and consultancy are typically 4-5
weeks.

 

 

 

 

From: James Pawson (U3C) mailto:ja...@unit3compliance.co.uk> > 
Sent: Monday, February 26, 2024 1:38 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG  
Subject: [PSES] 61010-1 hazardous live classification

 

Hello all,

 

I hope this safety question is a fairly simple one for you, it being Monday
after all.

 

1.  A piece of equipment with a power supply output for driving a lamp.
It has two modes, DC and pulsed.
2.  Both of the output voltage connections are on accessible terminals
(checked using finger probe)
3.  Classifying voltages as per EN 61010-1 clause 6.3.1 (limit values
for accessible parts, normal operating conditions)
4.  DC mode runs at 46Vdc maximum. This is less than 60Vdc so is not
Hazardous Live
5.  Pulse mode runs at 46Vdc pulsed (frequency up to 1kHz, duty cycle
can vary down to 0.01%) which is an AC waveform greater than 42.4V peak so
is Hazardous Live
6.  The output from the equipment is low impedance so is more than
capable of sourcing the required 0.7mA through the IEC 60990 body model.

 

Quick sketch attached to illustrate the concept. I even ran a SPICE
simulation to make sure I wasn't getting something wrong.

 

I would appreciate the sanity check!

 

All the best

James

 

James Pawson

Managing Director & EMC Problem Solver

 

Unit 3 Compliance Ltd

EMC : Environmental & Vibration : Electrical Safety : CE & UKCA :
Consultancy

 

www.unit3compliance.co.uk   |
ja...@unit3compliance.co.uk   

+44(0)1274 911747  |  +44(0)7811 139957

2 Wellington Business Park, New Lane, Bradford, BD4 8AL

Registered in England and Wales # 10574298

 

Office hours:

Every morning my full attention is on consultancy, testing, and
troubleshooting activities for our customers' projects. I'm
available/contactable between 1300h to 1730h Mon/Tue/Thurs/Fri.

For inquiries, bookings, and testing updates please send us an email on
 he...@unit3compliance.co.uk or call
01274 911747. Our lead times for testing and consultancy are typically 4-5
weeks.

 

 

 

 

  _  

This message is from the IEEE Product Safety Engineering Society emc-pstc
discussion list. To post a message to the list, send your e-mail to
EMC-PSTC@LISTSERV.IEEE.ORG   

All emc-pstc postings are archived and searchable on the web at: 
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Website: https://ewh.ieee.org/soc/pses/   
Instructions: https://ewh.ieee.org/soc/pses/list.html (including how to
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List rules: https://ewh.ieee.org/soc/pses/listrules.html 

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